I used bridle path the last time i had my saddle checked and they charged me £65 to say yes it fits for now call me in 6 months to re-check?! They were very good but very pricey.
I will not use Martin ever again.
And i was thinking about RB as its one of my local tack shops.
I recommend both Martin Wilkinson and Antonia Wills.
Personally wouldn't use RB as i have had bad fitting saddles from there which have caused problems and so have friends. However i know some people who have had saddles fitted there and they have fitted really well.